Looking to get a Boldt and want to be able to get a rack for two e-bikes and need a rear door-mounted solution as opposed to hitch mount (I don't want to interfere with the sensors on the bumper, cover the license plate, "bottom out" on a driveway, etc). Anyone have any luck with one? I see Fiamma makes one but these don't look heavy-duty enough for e-bikes. I understand Winnebago has had one of their own, but am told I can't order it as an option from the factory.